Halftone Alternatives

halftone reviews and mentions

• Ditherpunk 2 – beyond 1-bit
  4 projects | news.ycombinator.com | 12 Feb 2021

  The StackOverflow answer above is referenced by various Python halftoning projects, which have documented or at least commented halftone code you may be interested in:

  https://github.com/ClayFlannigan/halftone

  https://github.com/philgyford/python-halftone

  I think grandparent post is right, that you’re looking for the terms like halftone, halftoning, digital halftoning, binary halftoning, and the like. These are the terms that show up in papers:

  https://www.sciencedirect.com/science/article/abs/pii/S10473...

  Text discussion at Wikipedia: https://en.wikipedia.org/wiki/Halftone

  Having worked in digital press, I recall the term of art for a higher quality technique that came after “halftone screening” or “digital halftone” was “stochastic screening”:

  https://en.wikipedia.org/wiki/Stochastic_screening

  This prevented the tell-tale circle effect (moiré or rosette patterns) of traditional screening. We used it to print high quality magazine photography. It also worked on Mac Plus for rendering photography as a better dither for black and white dots of irregular or non-geometric photography — which brings us full circle to dithering.

  Using terms from Photoshop of the day, Pattern Dither uses a uniform pattern to represent levels of gray. Diffusion Dither uses a random pattern to represent levels of gray. Halftone Screen uses preset patterns (round, diamond, ellipse, line, square or cross) at frequencies and angles that can be varied as well.

  That brought another term to mind, “stippling”:

  https://github.com/joeedh/BlueNoiseStippling

  Some more terms show up in this discussion on difference between halftoning and dithering:

  https://photo.stackexchange.com/questions/5779/what-is-the-d...